Door sill insulator



Jan. 3, 1956 c. G. LYON DOOR SILL INSULATOR Filed Feb. 5, 1952 giiii fiq. 2

nited States Patent DOOR SILL INSULATOR Charles Geoifrey Lyon, Winnipeg, Manitoba, Canada Application February 5, 1952, eriai No. 276,075

1 Claim. (Cl. 20-64) Present methods of constructing door sills usually result in an upwardly projecting door stop across the doorway or threshold opening which forms a tripping hazard to a person passing through the doorway. While insulating material may be secured to these door stops, as a weatherstrip, it is exposed on the door contacting side and often scuffed by passing feet which thus reduces its insulating value besides creating an unsightly appearance at the door entrance.

The principal objects of the present invention are; to provide a door sill insulator which can be positioned across the sill or threshold of a door, with dust or draft insulation thereon for door contact, when closed, and provided with a sloping cover strip or plate over the insulation joint for smooth foot passage through the doorway; to prevent tripping; to protect the sill or threshold from undue wear by passing feet; and to prevent direct stress on the fastening means holding the device in position.

With the above important objects in view, the invention consists essentially in the construction, design and arrangement of the various parts hereinafter more particularly described, reference being had to the accompanying drawings in which:

Figure 1 is a partial perspective view of one end of the door sill insulator.

Figure 2 is a vertical sectional view through the lower part of a door and door sill, showing the door sill insulator in position and the door in contact therewith.

In the drawings like characters of reference indicate corresponding parts in the several figures.

A door sill or threshold is shown at 5 in Figure 2 and a door 6 is indicated thereabove. The door sill insulator, comprising this invention, is shown in both figures and presents a wood backing strip 2 of a relatively thin, right angle triangular-shape in cross section. A strip of sponge rubber 1 is suitably secured, such as by adhesive, to the narrow flat edge of this backing strip so that the two form "ice an integral unit. The base part of the triangular-shaped backing strip is placed on the sill or threshold with the rubber strip 2 thereof in contact with the bottom part of the door, when closed. A rectangular-shaped metal plate, or strip 3, of greater width than the backing strip, is placed thereover with one edge thereof resting on the sill while the other edge covers the backing strip, projects over the joint of the backing strip and the rubber strip, and partially overlies and rests on said rubber strip. Holes 4 are provided in the metal strip in zig-zag formation so that suitable nails (not shown) can be placed therein and hammered into the sill, some passing through the backing strip to retain it in position.

The metal strip 3 is at a slope, due to the triangularshape of the backing strip so that entering feet passing thereover will meet no obstruction and accordingly cannot trip. The sponge rubber, being protected by the overhanging metal strip or plate, does not become mutilated and therefore always presents a neat pleasing appearance besides maintaining its draft and dirt excluding properties. As the nail heads (not shown) will be dropped or countersunk flush with the face of the metal strip they will not only hold the parts in place but will permit free slipping movement of feet thereover. The sill itself will be protected against undue wear.

While I have mentioned that the backing strip is made of wood, the door contacting strip made of rubber and the covering strip made of metal, it will be understood that these parts may be made of other materials having similar characteristics and therefore I do not wish to be limited in this regard, or otherwise, except as defined by the scope of the claim.

I claim:

In combination with a door sill and a swingable door; an attachable insulating threshold construction, comprising: a backing strip of triangular-shaped cross section positioned on the sill, across the door opening; resilient material secured to the vertical edge of said backing strip for door contact therewith, when closed; a rectangular shaped flat plate, of greater width and overlying said backing strip; one edge of said plate contacting and partly overlying said resilient material and the other edge there of resting on and supported by the sill, in advance of said backing strip; holes in said plate; and fastening means passing through the holes and through the underlying backing strip to secure the above assembly to the sill.

References Cited in the file of this patent UNITED STATES PATENTS 

